linux-kernel - Re: [PATCH] drm/msm: adreno: a6xx: enable GMU bandwidth voting for x1e80100 GPU

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Message-ID: <ac476949-d0e7-4058-ad76-c3cc45691092@oss.qualcomm.com>
Date: Thu, 24 Jul 2025 20:05:46 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm: adreno: a6xx: enable GMU bandwidth voting for
 x1e80100 GPU

On 7/21/2025 6:05 PM, Neil Armstrong wrote:
> The Adreno GPU Management Unit (GMU) can also scale DDR Bandwidth along
> the Frequency and Power Domain level, but by default we leave the
> OPP core scale the interconnect ddr path.
> 
> Declare the Bus Control Modules (BCMs) and the corresponding parameters
> in the GPU info struct to allow the GMU to vote for the bandwidth.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> index 00e1afd46b81546eec03e22cda9e9a604f6f3b60..b313505e665ba50e46f2c2b7c34925b929a94c31 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> @@ -1440,6 +1440,17 @@ static const struct adreno_info a7xx_gpus[] = {
>  			.pwrup_reglist = &a7xx_pwrup_reglist,
>  			.gmu_chipid = 0x7050001,
>  			.gmu_cgc_mode = 0x00020202,
> +			.bcms = (const struct a6xx_bcm[]) {
> +				{ .name = "SH0", .buswidth = 16 },
> +				{ .name = "MC0", .buswidth = 4 },
> +				{
> +					.name = "ACV",
> +					.fixed = true,
> +					.perfmode = BIT(2),
> +					.perfmode_bw = 10687500,

This configurations should be similar to X1-45.

-Akhil

> +				},
> +				{ /* sentinel */ },
> +			},
>  		},
>  		.preempt_record_size = 4192 * SZ_1K,
>  		.speedbins = ADRENO_SPEEDBINS(
> 
> ---
> base-commit: 97987520025658f30bb787a99ffbd9bbff9ffc9d
> change-id: 20250721-topic-x1e80100-gpu-bwvote-9fc4690fe5e3
> 
> Best regards,